Means for fixing tappets to stamp-stems.



No. 000,460. l ENTBD 00T. s1, 1905.

N soN MEANS F I I G T IIIIIIIIIIIIIIIIIIIIIIII 5.

site hand to that of the other.

UNITED STATES PATENT OFFICE.

FREDERIC ANDERSON AND JAMES STUART JARVIS,4 OF EAST RAND, TRANSVAAL.

MEANS FOR FIXING TAPPETS TO STAMP-STENIS.

Specification o f Letters Patent.

Patented Oct. 31, 1905.

Application filed February 21, 1905. Serial No. 246,762.

To @ZZ .whom t may concern:

Be it known that we, FREDERIC ANDERSON and JAMEs STUART JARvIs,engineers, British subJects, residing at the East Rand, District ofWitwatersrand, in the Colony of the Transvaal, have invented new anduseful Improvements in Means for Fixing Tappets to Stamp- Stems,applicable also to analogous purposes, of which the following is aspecification.

This invention relates to means for fixing the tappets upon the stems ofa stamp-battery; and its object is to provide a tappet which is easilyfixed or removed, is cheap, and isnot subjected to the excessivebursting stress which occurs in the common type of' tappet.

Figure I is an elevation of the improved tappet. Fig. II is across-section upon the plane 2 2, Fig. I. Fig. III is a vertical sectionupon the plane 3 3, Fig. II; and Fig. IV 1s a perspective view of thelower wedge. In Figs. II'and III the lower wedge is supposed to beremoved, as is also the cotter in Fig. II.

In carrying out this invention the bore of a solid tappet c is suitablyrecessed at one side, as shown at b, to receive a pair of wedges c c.Said wedges are located one in the upper half and one in the lower halfof the tappet and are curved to t against the stem. They are doublytapered, as shown clearly in Figs. III and IV-that is to say,longitudinally away from the center of the tappet and transversely fromone sideA to the other-the result being virtually a single taper in adirection helical with respect to the stamp-stem. Also the thicker edgeof each is cut away obliquely and bears against a correspondinglyobliqueside or wall c in its recess. The arrangement is such that upon thewedges being thrust apart by a cotter t driven in between them or byother proper means each has a double motion, first, longitudinally awayfrom the center of' the tappet, which brings the longitudinal taper intoplay, and, secondly and concurrently, a transverse or rotative movementaround the stem, causing its transverse taper to become operative.Again, the oblique edge of one wedge is cut to the oppo- A mortise or ycotter-seat is cut through the wall of the tapl pet-body, as shown at G,so that the tapered cotter /t will contact at its upper and lower edgeswith the thicker ends of the wedges.

From the back of each wedge c a lugf projects into an aperture g, formedthrough the tappet body, and serves a double purpose, first, to apply aninstrument to when knocking back and loosening the wedge, and, secondly,to keep the wedge in place 'when placing the tappet upon the stem and toguide the wedge in its proper oblique path. The wedges are thrust apartby driving in the cotter /L between them and then moving it, asindicated by the arrows in Fig. I. It will be evident that anyconcussion or slip tending to slacken one wedge, whether longitudinallyor transversely, will have an exactly opposite effect upon the otherwedge,and thus the tappet automatically secures itself against forcestending to dislodge it. An important result is that the wedges do notneed to be tightened to the same extent as do the cotters of an ordinarytappet, and in consequence the improved tappet can be made of cheapermaterial than the present ones. y

It will be understood that the invention may be applied to variouspurposes analogous to that described-such, c. g., as fixing pulleys uponshafts, coupling two lengths of shafting together, or fixing stamp-headsupon their stems.

Sometimeseas, c. g., in fixing stam p-heads to their stems-when thelength to which the fixing means can be applied is restricted one onlyof the improved wedges may be ernployed; but it is evident that a bettereffect will be produced by using a pair, as described.

We claim as our inventionl. In a stamp-tappet or the like, a fixingmeans consisting of a wedge member fitting the stem on its inner faceand tapered longitudinally and transversely relatively to the tappet, acorrespondingly-shaped recess in the tappet-body and means for movingthe wedge member obliquely whereby both tapers are brought into play.

2. In a stamp-tappet or the like, a pair of wedge members fitting thestamp-stem on their inner faces and tapered longitudinally away from thecenter of the tappet and transversely in the tappet-body into whichproject lugs IO relatively thereto located in correspondinglyformed onthe backs ot' the wedges.

shaped recesses in the upper and lower halves In testimony whereof we axoursignatures respectively of the tappet-bodlv, and having' in presenceor' two subscribing witnesses.

5 their thicker edges cut away obliquely to op- FREDERIC ANDERSON.

posite hands and bearing` against eorresporid- JAMES STUART JARVIS.ingly-oblique sides oi' the recesses, a Cotter Vitnessesz adapted to beinserted between them to drive HAROLD ERNEST KIsoH,

them apart, and apertures arranged obliquely WVM. HY. HILLMAN.

